Why are the sierra nevada lakes very sensitive to changing climate?

Because the surrounding mountains contain very little soil, and nutrients are easily washed into the lakes, which could cause algae blooms and other problems. But It is not climate change, they are sensitive to different weather patterns.

Humans have survived and thrived in mexico city by using technology to create greater access to land. when the spanish conquered the aztec capital, tenochtitlan, in the 16th century, they built mexico city by draining the lakes and filling in the lake water to create more arable land for agriculture. this technique of land reclamation has continued to be fundamental to human civilization in mexico city.